feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
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- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

Mosaic Stack is not limited to coding — the Orchestrator and
subagents serve coding, business, design, marketing, writing,
logistics, analysis, and more.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/vue-best-practices/reference/perf-v-once-v-memo-directives.md

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+---
+title: Use v-once and v-memo to Skip Unnecessary Updates
+impact: MEDIUM
+impactDescription: v-once skips all future updates for static content; v-memo conditionally memoizes subtrees
+type: efficiency
+tags: [vue3, performance, v-once, v-memo, optimization, directives]
+---
+
+# Use v-once and v-memo to Skip Unnecessary Updates
+
+**Impact: MEDIUM** - Vue re-evaluates templates on every reactive change. For content that never changes or changes infrequently, `v-once` and `v-memo` tell Vue to skip updates, reducing render work.
+
+Use `v-once` for truly static content and `v-memo` for conditionally-static content in lists.
+
+## Task Checklist
+
+- [ ] Apply `v-once` to elements that use runtime data but never need updating
+- [ ] Apply `v-memo` to list items that should only update on specific condition changes
+- [ ] Verify memoized content doesn't need to respond to other state changes
+- [ ] Profile with Vue DevTools to confirm update skipping
+
+## v-once: Render Once, Never Update
+
+**Incorrect:**
+```vue
+<template>
+  <!-- BAD: Re-evaluated on every parent re-render -->
+  <div class="terms-content">
+    <h1>Terms of Service</h1>
+    <p>Version: {{ termsVersion }}</p>
+    <div v-html="termsContent"></div>
+  </div>
+
+  <!-- This content NEVER changes, but Vue checks it every render -->
+  <footer>
+    <p>Copyright {{ copyrightYear }} {{ companyName }}</p>
+  </footer>
+</template>
+```
+
+**Correct:**
+```vue
+<template>
+  <!-- GOOD: Rendered once, skipped on all future updates -->
+  <div class="terms-content" v-once>
+    <h1>Terms of Service</h1>
+    <p>Version: {{ termsVersion }}</p>
+    <div v-html="termsContent"></div>
+  </div>
+
+  <!-- v-once tells Vue this never needs to update -->
+  <footer v-once>
+    <p>Copyright {{ copyrightYear }} {{ companyName }}</p>
+  </footer>
+</template>
+
+<script setup>
+// These values are set once at component creation
+const termsVersion = '2.1'
+const termsContent = fetchedTermsHTML
+const copyrightYear = 2024
+const companyName = 'Acme Corp'
+</script>
+```
+
+## v-memo: Conditional Memoization for Lists
+
+**Incorrect:**
+```vue
+<template>
+  <!-- BAD: All items re-render when selectedId changes -->
+  <div v-for="item in list" :key="item.id">
+    <div :class="{ selected: item.id === selectedId }">
+      <ExpensiveComponent :data="item" />
+    </div>
+  </div>
+</template>
+```
+
+**Correct:**
+```vue
+<template>
+  <!-- GOOD: Items only re-render when their selection state changes -->
+  <div
+    v-for="item in list"
+    :key="item.id"
+    v-memo="[item.id === selectedId]"
+  >
+    <div :class="{ selected: item.id === selectedId }">
+      <ExpensiveComponent :data="item" />
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+
+const list = ref([/* many items */])
+const selectedId = ref(null)
+
+// When selectedId changes:
+// - Only the previously-selected item re-renders (selected: true -> false)
+// - Only the newly-selected item re-renders (selected: false -> true)
+// - All other items are SKIPPED (v-memo values unchanged)
+</script>
+```
+
+## v-memo with Multiple Dependencies
+
+```vue
+<template>
+  <!-- Re-render only when item's selection OR editing state changes -->
+  <div
+    v-for="item in items"
+    :key="item.id"
+    v-memo="[item.id === selectedId, item.id === editingId]"
+  >
+    <ItemCard
+      :item="item"
+      :selected="item.id === selectedId"
+      :editing="item.id === editingId"
+    />
+  </div>
+</template>
+
+<script setup>
+const selectedId = ref(null)
+const editingId = ref(null)
+const items = ref([/* ... */])
+</script>
+```
+
+## v-memo with Empty Array = v-once
+
+```vue
+<template>
+  <!-- v-memo="[]" is equivalent to v-once -->
+  <div v-for="item in staticList" :key="item.id" v-memo="[]">
+    {{ item.name }}
+  </div>
+</template>
+```
+
+## When NOT to Use These Directives
+
+```vue
+<template>
+  <!-- DON'T: Content that DOES need to update -->
+  <div v-once>
+    <span>Count: {{ count }}</span>  <!-- count won't update! -->
+  </div>
+
+  <!-- DON'T: When child components have their own reactive state -->
+  <div v-memo="[selected]">
+    <InputField v-model="item.name" />  <!-- v-model won't work properly -->
+  </div>
+
+  <!-- DON'T: When the memoization benefit is minimal -->
+  <span v-once>{{ simpleText }}</span>  <!-- Overhead not worth it -->
+</template>
+```
+
+## Performance Comparison
+
+| Scenario | Without Directive | With v-once/v-memo |
+|----------|-------------------|-------------------|
+| Static header, parent re-renders 100x | Re-evaluated 100x | Evaluated 1x |
+| 1000 items, selection changes | 1000 items re-render | 2 items re-render |
+| Complex child component | Full re-render | Skipped if memoized |
+
+## Debugging Memoized Components
+
+```vue
+<script setup>
+import { onUpdated } from 'vue'
+
+// This won't fire if v-memo prevents update
+onUpdated(() => {
+  console.log('Component updated')
+})
+</script>
+```
+
+## Reference
+- [Vue.js v-once Directive](https://vuejs.org/api/built-in-directives.html#v-once)
+- [Vue.js v-memo Directive](https://vuejs.org/api/built-in-directives.html#v-memo)
+- [Vue.js Performance - Update Optimizations](https://vuejs.org/guide/best-practices/performance.html#update-optimizations)